Tymipan for printing-presses



UNITED STATES PATENT OFFICE.

L. T. WELLS, OF CINCINNATI, OHIO.

TYMPAN FOR PRINTING-PRESSES.

Specification of Letters Patent No. 20,179, dated May 4, 1858.

To all whom it may concern:

Be it known that I, L. T. WELLS, of Cincinnati, in the county ofHamilton and State of Ohio, have invented a new and useful Improvementin Tympans for Printing- Presses; and I do hereby declare that thefollowing is a full, clear, and eXact description of the same, referencebeing had to the annexed drawings, making a part of this specification,in which- Figure l is a side view of my improvement, Fig. 2, is atransverse section of ditto, taken in the line Fig. l. Fig. 3, is anenlarged transverse section of the leather and one edge of the linen,parchment or other material used for the center of the tympan. 4

Similar letters of reference indicate corresponding parts in the severaligures.

This invention consists in a novel way of securing the linen, parchment,or other material used for the center of the tympan to the framethereof, whereby the linen or parchment may not only be readily attachedto and detached from the frame of the tympan but also prevented frombeing torn or injured at its point of connection therewith.

To enable those skilled in the art to fully understand and construct myinvention I will proceed to describe it.

A represents the frame of a tympan which is of rectangular formconstructed and applied to the bed of a hand press in the usual way. Thetwo side pieces (a) (a) and the foot or lower orosspiece are grooved orrabbeted at their inner edges to receive strips (c) of Calcutta or otherstrong leather, the grooves or rabbets being made of such a depth thatthe face surfaces of the leather strips when fitted in them will beflush with 'the face surfaces of the pieces (a) (a) (b) of the frame,see Fig. 2.

The leather strips (c) have eyelets (d) fitted in them at suitabledistances apart, and the leather strips (c) may be secured to the frameA by tacks (e) or by any suitable means. v

The head band (f) which connects the outer ends of the side pieces (a)(a) is of metal and is perforated with holes (g) coun` tersunk, thedistance between the holes (g) corresponding to the distance between theeyelets (d).

- B represents a piece of linen or other cloth, a parchment which formsthe center of the tympan. This linen or parchment has a hem (7L) formedaround its edge. This linen or parchment B is secured within the frame Aby means of a lace C, which is passed through the eyelets (d) in thevleather strips (c) of the holes (g) in the head band (f) and through thehem of the linen or parchment B. The hem may have `a cord fitted withinit if desired. By this arrangement the cloth or parchment B, may bereadily secured to the frame of the tympan. The edges of the cloth arenot liable to be torn, and when a new cloth is required the old one maybe readily detached from the frame and a new one adjusted or secured toit.

Having thus described my invention what I claim as new and desire tosecure by Letters Patent, is,

Attaching the cloth or parchment B to the frame A of the tympan, bymeansof the leather strips (c) provided with eyelets (d), said strips(c) being fitted in grooves or rabbets in the frame, and the cloth orparchment attached to the strip of the lace C, substantially asdescribed.

L. T. WELLS.

